GATE MT format:nat PYQs & Answers — Page 19 — Exam Papers

Questions 181–190 of 232. Imported answers require independent review unless marked reviewed.

Topic practice 232 questionsPage 19 of 24

If the solid-solid interfacial energy (

) is 0.87

and solid-liquid interfacial energy (

) is 0.5

, the dihedral angle (

, in degree, rounded off to one decimal place) during sintering is ________.

Diagram for Metallurgical Engineering question 53

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The maximum possible reduction (in mm, rounded off to one decimal place) of a 100 mm thick slab during rolling is ________.

Given: The coefficient of friction between roll and the slab is 0.2, and the roll diameter is 200 mm.

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An arc welding is performed at 400 Amperes, 20 V at a traverse speed of 5

. If the heat transfer efficiency is 0.6, the energy input per unit length (in

, rounded off to the nearest integer) during the process is ________.

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In the A-rich end of the A-B binary eutectic phase diagram (shown below), the solid and liquidus are straight lines.

Diagram for Metallurgical Engineering question 22

The freezing range of the alloy with 16% B is ________ (in °C to one decimal place)

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A vector field is given as follows:

The divergence of this field evaluated at

is ______________ .

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A plate of thickness h = 120 mm is cold rolled in a mill with a roll diameter of 200 mm. If the coefficient of friction

is 0.1, the maximum possible reduction

in a single pass is ______ (in mm to one decimal place)

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A copper-aluminium diffusion couple develops a certain concentration profile after an isothermal treatment at 600°C for 10 hours. The time required to achieve the same concentration profile at 500°C is ________ (in hours to 1 decimal place)

Given: The interdiffusion coefficient for copper in aluminium at 500°C and 600°C are

and

.

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A continuous and aligned carbon-fiber composite consists of 25 vol. % of fibers in an epoxy matrix. The Young’s modulus of fiber and matrix, respectively are

and

. If the composite is subjected to longitudinal loading (iso-strain condition and assuming elastic response), the fraction of load borne by the reinforcement is ______ (to two decimal places)

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Pure iron transforms from body centered cubic (BCC) to face centered cubic (FCC) crystal structure at 912 °C. If the lattice parameter of the BCC phase is 0.293 nm and that of the FCC phase is 0.363 nm, the associated volume change is ______ (in % to one decimal place)

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As shown in schematic below, an alloy is cast as a rectangular slab between two thick mould walls that differ in their thermal conductivities. Shrinkage defects are found at a distance L1 from Mould-1 with thermal conductivity

and distance L2 from Mould-2 with thermal conductivity

. If the ratio L1:L2 = 3:2, and assuming 1-D heat transfer, the ratio

is ______ (to two decimal places)

Diagram for Metallurgical Engineering question 43

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